21234166055 has 4 divisors (see below), whose sum is σ = 25480999272. Its totient is φ = 16987332840.

The previous prime is 21234166039. The next prime is 21234166073. The reversal of 21234166055 is 55066143212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21234166055 - 2⁴ = 21234166039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123416601 + ... + 2123416610.

It is an arithmetic number, because the mean of its divisors is an integer number (6370249818).

Almost surely, 2^21234166055 is an apocalyptic number.

21234166055 is a deficient number, since it is larger than the sum of its proper divisors (4246833217).

21234166055 is an equidigital number, since it uses as much as digits as its factorization.

21234166055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246833216.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21234166055 in words is "twenty-one billion, two hundred thirty-four million, one hundred sixty-six thousand, fifty-five".